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How sound sensor sense sound

A popular sound sensor is called a microphone. There are various designs and technology used, but the principle is the same.
You need a diaphragm. This is any (generally thin and light) material that is suspended in air. The pressure waves in air, that we call sound, make the diaphragm move.
In a dynamic type microphone, a coil of fine wire is also attached to the diaphragm and is surrounded by a magnet.
As the coil moves, so it generates small amounts of electricity, which can then be amplified and manipulated how you want.

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